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Preparation of Alcohols from Grignard Reagents

The aldehydes...

Question

The aldehydes which will not form Grignard product with one equivalent Grignard reagents are:

A

(B), (C), (D)

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B

(B), (D)

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C

(B), (C)

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D

(C), (D)

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Solution

The correct option is D $(B), (D)$
Acid-base reaction of grignard reagent are fast.

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Similar questions

Q. An organic compound

A

with molecular formula

C_{3} H_{6} O

is resistant to oxidation but forms compound

B

C_{3} H_{8} O

on reduction, compound

B

H B r

C

C

M g

from Grignard reagent.

D

A

to form a product which on hydrolysis gives

E

A, B, C, D, E

R - O H P B r_{3} - -- \to A M g / D r y e t h e r - ------- \to B G r i g n a r d r e a c t i o n - ---------- \to C H_{2} - C H_{2} - O C H^{+} / H_{2} O - ---- \to D

A, B, C

D

are respectively?

Grignard reagent is usually prepared by :

R - X + M g E t_{2} O - -- \to R M g X

Grignard reagent

A r - X + M g E t_{2} O - -- \to A r M g X

Grignard reagent

Grignard reagent acts as a strong base. Grignard reagent carry out nucleophilic attack in absence of acidic hydrogen. Grignard reagent form complex with its ether solvent. Complex formation with molecule of ether is an important factor in the formation and stability of Grignard reagent.

Which of the following Grignard reagents are not possible ?

Q. A Grignard reagent [A] and a haloalkane [B] react together to give [C]. Compound [C] on heating with KOH yields a mixture of two geometrical isomers, (D) and (E), of which (D) predominates isomers. (C) and (E) have the same molecular formula but (C) gives 1-bromo-3-phenylpropane on reaction with HBr in the presence of a peroxide. Give structures of (A), (B) and (C) and configuration of (D) and (E) with reasons.

Q. Which of the following aldehydes can produce

1^{o}

alcohols when treated with Grignard reagent?

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